271 lines
6.7 KiB
C
271 lines
6.7 KiB
C
/*-
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* Copyright (c) 2005 Olivier Houchard
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* Copyright (c) 1989, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software developed by the Computer Systems
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* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
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* BG 91-66 and contributed to Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* ARM machine dependent routines for kvm.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/endian.h>
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#include <kvm.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#ifdef __arm__
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#include <machine/vmparam.h>
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#endif
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#include "kvm_private.h"
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#include "kvm_arm.h"
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struct vmstate {
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arm_pd_entry_t *l1pt;
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size_t phnum;
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GElf_Phdr *phdr;
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};
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/*
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* Translate a physical memory address to a file-offset in the crash-dump.
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*/
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static size_t
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_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz)
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{
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struct vmstate *vm = kd->vmst;
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GElf_Phdr *p;
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size_t n;
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p = vm->phdr;
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n = vm->phnum;
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while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
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p++, n--;
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if (n == 0)
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return (0);
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*ofs = (pa - p->p_paddr) + p->p_offset;
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if (pgsz == 0)
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return (p->p_memsz - (pa - p->p_paddr));
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return (pgsz - ((size_t)pa & (pgsz - 1)));
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}
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static void
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_arm_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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free(vm->phdr);
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free(vm);
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kd->vmst = NULL;
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}
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static int
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_arm_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
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!_kvm_is_minidump(kd));
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}
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static int
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_arm_initvtop(kvm_t *kd)
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{
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struct vmstate *vm;
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struct kvm_nlist nl[2];
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kvaddr_t kernbase;
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arm_physaddr_t physaddr, pa;
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arm_pd_entry_t *l1pt;
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size_t i;
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int found;
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if (kd->rawdump) {
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_kvm_err(kd, kd->program, "raw dumps not supported on arm");
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return (-1);
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}
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vm = _kvm_malloc(kd, sizeof(*vm));
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if (vm == 0) {
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_kvm_err(kd, kd->program, "cannot allocate vm");
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return (-1);
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}
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kd->vmst = vm;
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vm->l1pt = NULL;
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if (_kvm_read_core_phdrs(kd, &vm->phnum, &vm->phdr) == -1)
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return (-1);
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found = 0;
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for (i = 0; i < vm->phnum; i++) {
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if (vm->phdr[i].p_type == PT_DUMP_DELTA) {
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kernbase = vm->phdr[i].p_vaddr;
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physaddr = vm->phdr[i].p_paddr;
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found = 1;
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break;
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}
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}
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nl[1].n_name = NULL;
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if (!found) {
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nl[0].n_name = "kernbase";
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if (kvm_nlist2(kd, nl) != 0) {
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#ifdef __arm__
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kernbase = KERNBASE;
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#else
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_kvm_err(kd, kd->program, "cannot resolve kernbase");
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return (-1);
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#endif
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} else
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kernbase = nl[0].n_value;
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nl[0].n_name = "physaddr";
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if (kvm_nlist2(kd, nl) != 0) {
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_kvm_err(kd, kd->program, "couldn't get phys addr");
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return (-1);
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}
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physaddr = nl[0].n_value;
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}
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nl[0].n_name = "kernel_l1pa";
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if (kvm_nlist2(kd, nl) != 0) {
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_kvm_err(kd, kd->program, "bad namelist");
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return (-1);
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}
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if (kvm_read2(kd, (nl[0].n_value - kernbase + physaddr), &pa,
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sizeof(pa)) != sizeof(pa)) {
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_kvm_err(kd, kd->program, "cannot read kernel_l1pa");
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return (-1);
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}
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l1pt = _kvm_malloc(kd, ARM_L1_TABLE_SIZE);
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if (kvm_read2(kd, pa, l1pt, ARM_L1_TABLE_SIZE) != ARM_L1_TABLE_SIZE) {
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_kvm_err(kd, kd->program, "cannot read l1pt");
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free(l1pt);
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return (-1);
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}
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vm->l1pt = l1pt;
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return 0;
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}
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/* from arm/pmap.c */
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#define ARM_L1_IDX(va) ((va) >> ARM_L1_S_SHIFT)
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#define l1pte_section_p(pde) (((pde) & ARM_L1_TYPE_MASK) == ARM_L1_TYPE_S)
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#define l1pte_valid(pde) ((pde) != 0)
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#define l2pte_valid(pte) ((pte) != 0)
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#define l2pte_index(v) (((v) & ARM_L1_S_OFFSET) >> ARM_L2_S_SHIFT)
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static int
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_arm_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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struct vmstate *vm = kd->vmst;
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arm_pd_entry_t pd;
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arm_pt_entry_t pte;
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arm_physaddr_t pte_pa;
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off_t pte_off;
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if (vm->l1pt == NULL)
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return (_kvm_pa2off(kd, va, pa, ARM_PAGE_SIZE));
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pd = _kvm32toh(kd, vm->l1pt[ARM_L1_IDX(va)]);
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if (!l1pte_valid(pd))
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goto invalid;
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if (l1pte_section_p(pd)) {
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/* 1MB section mapping. */
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*pa = (pd & ARM_L1_S_ADDR_MASK) + (va & ARM_L1_S_OFFSET);
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return (_kvm_pa2off(kd, *pa, pa, ARM_L1_S_SIZE));
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}
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pte_pa = (pd & ARM_L1_C_ADDR_MASK) + l2pte_index(va) * sizeof(pte);
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_kvm_pa2off(kd, pte_pa, &pte_off, ARM_L1_S_SIZE);
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if (pread(kd->pmfd, &pte, sizeof(pte), pte_off) != sizeof(pte)) {
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_kvm_syserr(kd, kd->program, "_arm_kvatop: pread");
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goto invalid;
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}
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pte = _kvm32toh(kd, pte);
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if (!l2pte_valid(pte)) {
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goto invalid;
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}
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if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
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*pa = (pte & ARM_L2_L_FRAME) | (va & ARM_L2_L_OFFSET);
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return (_kvm_pa2off(kd, *pa, pa, ARM_L2_L_SIZE));
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}
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*pa = (pte & ARM_L2_S_FRAME) | (va & ARM_L2_S_OFFSET);
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return (_kvm_pa2off(kd, *pa, pa, ARM_PAGE_SIZE));
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invalid:
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_kvm_err(kd, 0, "Invalid address (%jx)", (uintmax_t)va);
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return 0;
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}
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/*
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* Machine-dependent initialization for ALL open kvm descriptors,
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* not just those for a kernel crash dump. Some architectures
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* have to deal with these NOT being constants! (i.e. m68k)
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*/
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#ifdef FBSD_NOT_YET
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int
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_kvm_mdopen(kvm_t *kd)
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{
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kd->usrstack = USRSTACK;
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kd->min_uva = VM_MIN_ADDRESS;
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kd->max_uva = VM_MAXUSER_ADDRESS;
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return (0);
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}
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#endif
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int
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_arm_native(kvm_t *kd)
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{
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#ifdef __arm__
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB);
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#else
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return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB);
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#endif
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#else
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return (0);
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#endif
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}
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struct kvm_arch kvm_arm = {
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.ka_probe = _arm_probe,
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.ka_initvtop = _arm_initvtop,
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.ka_freevtop = _arm_freevtop,
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.ka_kvatop = _arm_kvatop,
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.ka_native = _arm_native,
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};
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KVM_ARCH(kvm_arm);
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